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Theory of Machine

Theory of Machine
Elements of pairs held together mechanically is known as

Closed pair
Open pair
Mechanical pair
Rolling pair

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Theory of Machine
The relation between number of pairs (p) forming a kinematic chain and the number of links (l) is

l = 2p - 5
l = 2p - 4
l = 2p - 3
l = 2p - 2

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Theory of Machine
Whirling speed of the shaft is the speed at which

Shaft tends to vibrate in longitudinal direction
Combination of transverse and longitudinal vibration occurs
Shaft tends to vibrate vigorously in transverse direction
Torsional vibrations occur

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Theory of Machine
A slider crank chain consists of following numbers of turning and sliding pairs

2, 2
3, 1
1, 3
4, 0

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Theory of Machine
The type of pair formed by two elements which are so connected that one is constrained to turn or revolve about a fixed axis of another element is known as

Turning pair
Sliding pair
Spherical pair
Rolling pair

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Theory of Machine
In S.H.M., the velocity vector w.r.t. displacement vector

Leads by 180°
Leads by 90°
Lags by 90°
Are in phase

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